Malicious PDF — malware analysis report

Static analysis result for SHA-256 bed25009e8e95783…

MALICIOUS

PDF

70.2 KB Created: 2021-04-05 11:30:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e819ee038abc40f9f368b653107fa289 SHA-1: dba2bbe583461ac442cbf2538746bf4dd2ef0685 SHA-256: bed25009e8e9578388b1c5c6747e4677a10d768b4f84d4cb13bc65979021e34a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to seemingly unrelated PDF files, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://kuzutuzo.ru/award?keyword=livro+administra%25C3%25A7%25C3%25A3o+de+marketing+kotler+pdf
    • https://gadufekovofu.weebly.com/uploads/1/3/4/7/134764592/lerefuwomusuni_munuzaru_zusezazav_tanomixowi.pdf
    • http://lukunezevowazol.sportsontheweb.net/saveroforategafes.pdf
    • http://alexsaf.ru/how_to_lose_weight_on_a_heart_healthy_dietpk3dg.pdf
    • https://cdn-cms.f-static.net/uploads/4412778/normal_605f8fcbcebb5.pdf
    • https://duzopotubesafes.weebly.com/uploads/1/3/4/8/134890215/satolakamo.pdf
    • http://kekewawoxugar.sportsontheweb.net/nunuvum.pdf
    • http://jikusofare.mywebcommunity.org/sofavonej.pdf
    • http://flowerport.market/ginovipuvedv8nh.pdf
    • https://zikixitifo.weebly.com/uploads/1/3/4/8/134897390/bbab041.pdf
    • https://cdn-cms.f-static.net/uploads/4477916/normal_5fd34ca1826cd.pdf
    • https://kopusitubo.weebly.com/uploads/1/3/4/6/134698796/ecb01.pdf
    • https://static.s123-cdn-static.com/uploads/4368747/normal_5fed26279407f.pdf
    • http://test123test.xyz/32321501225or0io.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dagasopones/mujaxagar.pdf
    • https://s3.amazonaws.com/wibedubosateg/netutufabob.pdf
    • https://s3.amazonaws.com/mukut/maytag_appliance_repair_green_bay_wi.pdf
    • https://s3.amazonaws.com/tevigotu/how_do_you_prove_that_light_is_necessary_for_photosynthesis.pdf
    • https://s3.amazonaws.com/wovugi/gilimijenofamubukikubu.pdf
    • https://s3.amazonaws.com/boxalewijim/34165870378.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf42.bin
ca10a19e047084341ecc1fdaa96bb56a6565b1319010deb07f33e001c81f6a12		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF42 5924 bytes
font_01_sfnt_off0000e2d8.bin
c9ce8fa88e47ab6b3e31feeed7627a4ffd9c2df1afbf3d99f09f57867b8674ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D8 12896 bytes

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